Steam-engine.



R. V. MCMULLBN.

STEAM ENGINE.

APPLICATION FILED AUG.4. 191a.

Patented May 5, 1914.

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STEAM ENGINE.

APPLICATION FILED AUG. 4, 1913.

1,095,968; Patented May 5, 1914.

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R. V. MGMULLEN. STEAM ENGINE.

APPLICATION FILED AUG. 4, 191a.

Patented May 5, 1914.

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STEAM-ENGINE.

' To all whom it may concern:

Be it known that I, Ronnn'r V. McMUL- LEN, a citizen of the United States, residing at the city of Santa Maria, in the county of Santa Barbara and State of California, have invented new and useful Improvements in Steamllngines, of which the following is a specification.

My invention relates tov reciprocating steam engines and the object thereof is to provide a slide valve and ports and acontrol for the valve by means of which an engine may be run in either direction with only one eccentric. I accomplish this object by the mechanism described herein and illustrated in the accompanying drawings forming a part hereof in which:

Figure l is a side elevation of an engine equipped with my improved valve with parts removed and parts broken away. Fig. 2 is a longitudinal central section of the valve and a part of the cylinder when the parts are in position for forward running. Fig. 3 is a like view whenthe parts are in position for rearward running. Figs. 4 and 5 are enlarged detailed views of a portion of the mechanism for shifting the position of the valve in the chest. Fig. 6 is a section on the line 66 of Fig. 4.

In the drawings 10 is a slide valve, which has in one of its surfaces out-er chambers 11 and 12 which in a valve 7;; inches long and about two inches deep and 5 inches wide, commence one eighth of an inch from the ends and extend toward each other one and one fourth inches. Chamber 11 is about one eighth of an inch in depth and chamber 12 is about one half in depth. Intermediate the end chambers are central chambers 13 and 14 which are about one half inch in depth and are about one and one half inches in length. Chamber 13 commences one eighth of an inch from chamber 11 and chamber 14 commences five eighths of an inch from chamber 12. A channel 15 about one fourth inch in width, extends through the valve body and its outer edge registers with the outer edge of chamber 13. A channel 16 about one fourth inch in width, extends through the valve body and its outer edge registers with the outer edge of chamber 14. By outer edge is meant the edge nearest an end of the valve. At one fourth of an inch from the inner end of chamber 14 a channel 17 one fourth of an inchin width extends through the valve Specification of Letters Patent.

Application filed August 4, 1913.

Patented May 5, 1914.

Serial No. 782,779.

body. Extending from the ends of cylinder 18 and terminating in the valve seat, are channels 19 and 20. The valve seat ends of these channels are two and one-half inches from center to center. Outside the valve seat ends of channels 19 and 20 are exhaust channels 21 and 22 whose centers are one inch from the centers of channels 19 and 20. In the valve chest 23 are channel closure bars 24 and 25 which ext-end transversely the chest and hold the valve on its seat. Bar 24 is two and one quarter inches long and bar 25 is one and one-quarter inches long. Bar 24 is opposite exhaust'port 21 and extends three quarters of an inch to the left of the center line thereof prolonged. Bar 25 is opposite exhaust port 22 and extends three eighths of an inch to the left of the center line thereof prolonged. These bars close certain of the channels at different times as hereafter explained.

Connected to the valve is valve rod 26 which runs to and is connected to shank 27 of yoke 28. The shank of the yoke runs through a guide bearin 29 secured to the frame 30. This yoke has a longitudinal slot 28 therein. A shifting or lengthening block 31 having a transverse diagonal slot 32 therein is slidably mounted inyoke 28. The extreme ends of the slot are preferably parallel with the edges of the block. On the lower end of the block is a lug 33 slidably mounted in a. slot in block 34. Block 34 is slidably mounted in a dovetailed groove in the side of the engine bed and is pivotally connected to link 35. To the upper end of link 35 is pivotally connected the shorter arm 36 of the shifting lever. The longer arm 37 of the shifting lever is pivotally connected to shifting rod 38 by means of which the position of block 31 is controlled. Block 31 has a longitudinal central slot 39 therein whose central plane is at right angles to the face of the block at slot 32. A connecting bolt 40 passes through slots 28 and 32 and through the end of eccentric rod 41. Rod 41 is operated by eccentric 42 on crank shaft 43. Shaft 43 carries crank 44 on which is mounted connecting rod 45. Rod 45 is connected to the usual cross head of the engine.

46 is the steam pipe which admits steam to the chest.

47 is the piston.

In Fig. l shifting block 31 is at its extreme downward thrust and the engine is running in the forward direction. At this time steam is admitted through channels 17 and 19 and is exhausting through channel 20, chamber 12 and port 22 as shown in Fig. 2. To reverse the engine the operator moves block 31 to its extreme upward thrust thereby lengthening the distance between the slide valve and the eccentric and thereby changing the position of the slide valve in the valve chest. In this last position steam enters through channel 16, chamber 1% and channel 20 and exhausts through channel 19, chamber 13 and port 21. Chamber 11 lessens the contact of the valve on its seat and also carries a certain amount of steam for lubrication.

By this construction I am able to reverse the direction of a reciprocating engine and use only one eccentric, thereby dispensing with the second eccentric and connected mechanism now in common use.

In the foregoing description I have given dimensions of a. valve that I have found gives satisfactory results but it will be understood that the chambers and passages or ports in the valve body and the channels in the walls of the steam chest and the length of the channel closure bars will be varied to suit the size of the engine. The channel closure bars may be provided with longitudinal channels 1-8 to equalize the steam pressure around the valve body.

Having described my invention what I claim is 1. In a steam engine a valve chest having in one of its walls separate induction and eduction channels extending from the central portions of the chest to the outer ends of the piston cylinders; exhaust channels outside of and near the induction and eduction channels; a. valve body slidable against the wall of the chest having said channels, said valve body having outer chambers in the face thereof which contacts with the channeled wall of the chest and intermediate chambers between the outer chambers and channels extending from the opposite face of the valve body and terminating in the outer ends of the intermediate chambers; and a channel between the other channels eX- tending from one face to the other face of the valve body and equidistant from the other channels; separated channel closure bars in said steam chest contacting with the face of the valve body opposite its chambered face; in combination with means to change the position of the valve body in the chest.

2. In a reciprocating steam engine a steam chest having in the walls thereof ports extending to the outer end of the steam cylinder and also having exhaust ports, said engine also having a sliding valve in the steam chest provided with ports and chambers and passages therein and therethrough so arranged that when the valve is in one po sition in the chest ports and passages are connected which cause the engine to run in one direction, and when the position of the valve is shifted in the chest other ports and passages are connected which cause the engine to run in the reverse direction; means to operate the valve comprising a yoke connected to the valve; a shifting block having a transverse diagonal slot therein and a longitudinal slot at right angles to the diagonal slot mounted in and movable through said yoke; means to move said block; an eccentric rod mounted in the longitudinal slot of the block; a bolt passing through the end of the eccentric rod and the diagonal slot in the block; and means to operate the eccentric rod.

In witness that I claim the foregoing I have hereunto subscribed my name this 17th day of July, 1913.

ROBERT V. MCMULLEN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

